Display device and method of displaying an image

Abstract

A method of displaying an image, wherein a first density of image pixels, each comprising a sub-pixel is displayed on a display having a second density of display pixels. Each display pixel has at least two spatially offset display sub-pixels. The display sub-pixels are able to display a first color and a second color, respectively. According to the invention, the image is resized to an intermediate image having a third density of intermediate image pixels, each comprising an intermediate image sub-pixel, and the display sub-pixels are displayed with a respective intensity which is determined from the corresponding intermediate image sub-pixels. This reduces the image artifacts when the display screen is used with different image standards.

1. A method of displaying an image, the method comprising a step of providing a first density of image pixels, each comprising a sub-pixel, a step of providing a display having a second density of display pixels, the second density being smaller than the first density, and each display pixel comprising two spatially offset display sub-pixels being able to display a first color and a second color, respectively, and a step of displaying the display sub-pixels with an intensity which depends on the corresponding image sub-pixels,
 wherein the method further comprises, before the step of displaying,  
 a step of resizing the first density of first image pixels to a third density of intermediate image pixels, each comprising an intermediate image sub-pixel, and  
 a step of determining the display sub-pixels from a predetermined number of corresponding intermediate image sub-pixels.  
 
     
     
       2. A method as claimed in  claim 1 , wherein intermediate pixels have a higher density than the display pixels. 
     
     
       3. A method as claimed in  claim 1 , wherein the display sub-pixels are arranged in a display grid and the intermediate image pixels are arranged in an intermediate grid, and the ratio between the third density and the second density is determined from an integer multiple of the minimum number of points of the intermediate grid to depict the grid corresponding to the display sub-pixels. 
     
     
       4. A method as claimed in  claim 3 , wherein the display sub-pixels are arranged in a hexagonal grid and the ratio between the third density of intermediate pixels and the second density of display pixels is an integer multiple of 3×2. 
     
     
       5. A display device comprising
 means for providing a first density of image pixels, each comprising an image sub-pixel,  
 a display screen having a second density of display pixels, which is smaller than the first density, each display pixel comprising two spatially offset display sub-pixels being able to display a first and a second color, respectively,  
 processing means for displaying the display sub-pixels with an intensity which depends on the corresponding image sub-pixels, and  
 means for resizing the first density of first image pixels to a third density of intermediate image pixels, each comprising an intermediate image sub-pixel,  
 wherein the processing means are further arranged to determine the display sub-pixels from a predetermined number of corresponding intermediate image sub-pixels.  
 
     
     
       6. The display device of  claim 5 , wherein the intermediate pixels have a higher density than the display pixels. 
     
     
       7. The display device of  claim 5 , wherein the display sub-pixels are arranged in a display grid and the intermediate image pixels are arranged in an intermediate grid, and wherein the second density is an integer multiple of the minimum number of points of the intermediate grid to depict the grid corresponding to the display sub-pixels. 
     
     
       8. The display device of  claim 7 , wherein the display sub-pixels are arranged in a hexagonal grid and the ratio between the third density of intermediate pixels and the second density of display pixels is an integer multiple of 3×2. 
     
     
       9. A method of displaying an image, the method comprising:
 receiving an input image comprising image pixels having a first density, each image pixel including at least one image sub-pixel;  
 providing a display including display pixels having a second density, the second density being less than the first density, and each display pixel comprising at least two spatially offset display sub-pixels adapted to display a first color and a second color, respectively;  
 converting the input image to an intermediate image comprising intermediate image pixels having a third density less than the first density, each intermediate image pixel comprising at least one intermediate image sub-pixel;  
 determining the display sub-pixels from a predetermined number of intermediate image sub-pixels; and  
 displaying the display sub-pixels with an intensity which depends on the corresponding intermediate image sub-pixels.  
 
     
     
       10. The method of  claim 9 , wherein determining the display sub-pixels from a predetermined number of intermediate image sub-pixels includes passing the intermediate image sub-pixels through a two dimensional filter. 
     
     
       11. The method of  claim 9 , wherein each display pixel comprises a red display sub-pixel, a blue display sub-pixel, and a green display sub-pixel, and wherein each intermediate image pixel comprises a red intermediate image sub-pixel, a blue intermediate image sub-pixel, and a green intermediate image sub-pixel. 
     
     
       12. The method of  claim 11 , wherein the display sub-pixels are arranged in a display grid and the intermediate image pixels are arranged in an intermediate grid, wherein positions of the green intermediate image sub-pixels are symmetrical with respect to positions of the green display sub-pixels, and wherein positions of the red and blue intermediate image sub-pixels are not symmetrical with respect to positions of the red and blue display sub-pixels, respectively. 
     
     
       13. The method of  claim 12 , wherein determining the display sub-pixels from a predetermined number of intermediate image sub-pixels includes:
 passing the green intermediate image sub-pixels through a first two dimensional filter centered around the green display sub-pixels,  
 passing the red intermediate image sub-pixels through a second two dimensional filter that is not centered around the red display sub-pixels; and  
 passing the blue intermediate image sub-pixels through a third two dimensional filter that is not centered around the blue display sub-pixels.  
 
     
     
       14. The method of  claim 11 , wherein determining the display sub-pixels from a predetermined number of intermediate image sub-pixels includes passing the green intermediate image sub-pixels, the red intermediate image sub-pixels and the blue intermediate image sub-pixels through a same two dimensional filter. 
     
     
       15. The method of  claim 9 , wherein the display sub-pixels are arranged in a hexagonal grid and the ratio between the third density of intermediate pixels and the second density of display pixels is an integer multiple of 3×2.